Portable telephone



FIG. 1 is a front, bottom, and left side perspective view showing our new design for a portable telephone;

FIG. 2 is a back, top, and left side perspective view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a rear elevation view thereof.

The broken line showings are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a portable telephone, as shown and described. 